Does anybody know the rules on sub-metering via prepaid meters feeding commercial customers that have safety services installed. For example if I have a DNO supply coming into commercial building A but from building A it feeds into commercial building B. They are different landlords and building A wants to install a prepaid arrangement as bills are not being paid. Now if building B has a safety service in the form of for evac lifts or smoke vent etc what are the rules on installing a prepaid metering online system. Is it allowed, the system can be toped up online and a direct debiting system can be implemented so it is always topped up. I would presume so as like in a normal building if you don’t pay your bill you’ll get cut off.